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JavaScript

Posted by Bruno Dias
Bruno Dias
10,554 Points

Print an array index and show 1 instead of 0

How can I print an index of an array and display 1 instead of 0 as the first item? Here is what I mean:

var playList = [

  [ 'I Did It My Way', 'Frank Sinatra' ],
  [ 'Respect', 'Aretha Franklin' ],
  [ 'Imagine', 'John Lennon' ],
  [ 'Born to Run', 'Bruce S.' ],
  [ 'Louie Louie', 'The Kingsmen' ],
  [ 'Maybellene', 'Chucky B.' ]

];

function print(message) {
  document.write(message);
}

function printSongs(songs) {
  var listHTML = '<ul>';
  for ( var i = 0; i < songs.length; i++) {
    listHTML += '<li>' + i + " " + songs[i][0] + ' by ' + songs[i][1] + '</li>';
  }
  listHTML += '</ul>';
  print(listHTML);
}

printSongs(playList);

This code prints:

0 I Did It My Way by Frank Sinatra
1 Respect by Aretha Franklin
2 Imagine by John Lennon
3 Born to Run by Bruce S.
4 Louie Louie by The Kingsmen
5 Maybellene by Chucky B.

but I wanted to display the index number to start from 1 instead of 0. Is it possible to do that and how can I dot it?

1 Answer

jcorum
jcorum
71,830 Points

Several small changes:

  for ( var i = 1; i <= songs.length; i++) {
    listHTML += '<li>' + i + " " + songs[i-1][0] + ' by ' + songs[i-1][1] + '</li>';
  }

Since the numbers are the loop counter, all you need to do is have it run from 1 to songs.length, instead of from 0 to songs.length - 1 (< songs.length)

You also need to change i to i - 1 in the subscripts.